Issue legal notice and file a civil suit. Pending suit seek for an order against seller not to alienate the flat to third parties 

If there is written agreement then the terms of agreement shall prevail. However, raise demand of refund and file suit for recovery. 

You mean the seller is not agreeing to sell the property beyond the time stipulated in the sale agreement and is not willing to return the advance amount also.

Well, you can file a suit for specific performance of contract before the jurisdictional civil court and seek direction by court to the seller to execute the sale deed after receiving the balance of sale consideration amount failing which you can ask the court to do the registration  by itself.

Alternately you can seek for refund of advance amount with interest from the date of payment.

It will depend on the terms of the agreement to sale. You need to make good the loss to the seller by your act of not adhering to the stems of arrangement of total amount of sale consideration 

Is there forfeiture clause in agreement for sale 

2) issue legal notice to seller to execute registered sale deed or in alternative refund money paid with interest 

3) if seller refuses file suit for specific performance 

Sale Agreement will be valid for 3 years. Send a legal notice to the seller to return your advance amount or to execute sale deed in your favour.

You can very much force seller to execute sale deed in your favour. File a suit for specific  performance of agreement to sale depositing dd for the balance sale consideration. Obtain stay against sale of property to third parties by seller. If you can give valid reason for delay in payment of balance of sale consideration, Court will pass decree for performance of agreement against him.

- As per law, you can cancel the agreement due to unforeseen reasons , and the said seller is bound to refund the entire amount paid by you. 

- You can send him a legal demand notice for getting the refund of the amount 

- If no refund is done , then file a recovery suit before the court. 

- Further, if you wanted to purchase the said flat after paying the remaining amount , then file a suit for Specific Performance before the court. 

You have to file suit of specific performance.  

sale agreement in which we agreed to pay remaining amount in 2 months ? IS there any clause that if the remaining amount is not paid in 2 months, advance will forfeit by seller or deal will cancel. 

Dear Client,

In the event of a documented agreement, the stipulated terms shall take precedence. Nevertheless, if a refund is requested and legal action for recovery is necessary, such action may be pursued.